Abstract: Laohekou oil field is located at the north slope of Chengdong arch, and the upper Guantao Formation is the main oil-bearing series. The Chengbei oil-generative sag is north of Laohekou oil field, which has ample oil source supplies. Multi-stage developed meandering stream sandstone bodies have formed a lot of lithologic reservoirs in the upper Guantao Formation which are buried shallowly and has large superposition area and simple oil-reservoir type. Using horizontal slice and spectral separability on exploration deployment and reserves computation, achieves satisfactory result. It reflects distribution of oil layer truly and dopes out geological reserves better.